A roller coaster car of mass 200kg is released from rest at the top of 60 m high hill (position A) and rolls with negligible friction down the hill, through a circular loop of radius 20 m( positions B,C, and D) and along a horizontal track (to position E). (a) What is the velocity of the car at position B? (b) What is the velocity of the car at position C? (c) How much kinetic energy does it have at position E? (Non-anonymous question) * (6 Points)